18220039568 has 10 divisors (see below), whose sum is σ = 35301326694. Its totient is φ = 9110019776.

The previous prime is 18220039517. The next prime is 18220039577. The reversal of 18220039568 is 86593002281.

It can be written as a sum of positive squares in only one way, i.e., 10956227584 + 7263811984 = 104672^2 + 85228^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 569376221 + ... + 569376252.

Almost surely, 2^18220039568 is an apocalyptic number.

It is an amenable number.

18220039568 is a deficient number, since it is larger than the sum of its proper divisors (17081287126).

18220039568 is a wasteful number, since it uses less digits than its factorization.

18220039568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1138752481 (or 1138752475 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 44.

The spelling of 18220039568 in words is "eighteen billion, two hundred twenty million, thirty-nine thousand, five hundred sixty-eight".